Design of reinforced concrete beams with steel fibers in the ultimate limit state

Buttignol, Thomaz Eduardo Teixeira; Fernandes, Juliana Ferreira; Bittencourt, Túlio Nogueira; Sousa, J. L. A. O.

doi:10.1590/s1983-41952018000500006

Cited by 3 publications

(1 citation statement)

References 16 publications

(16 reference statements)

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“…The exact value for s is between h /2 15 and 2 h , 14 with h the height of the cracked section. The Model Code 2010 (MC10) suggests for systems with only one crack that s ≡ ℓ cs = h = 125 mm, which is also confirmed in literature as an appropriate value 16, 17 . This value is adopted here and relates the crack width w , or any deformation δ in general, to a smeared strain ɛ in accordance with Equation ):

normalɛ = w / s = δ / s .

…”

Section: Overview Of the Sectional Analysismentioning

confidence: 79%

Sectional analysis of the flexural creep of cracked fiber reinforced concrete

Vrijdaghs

Prisco

2021

Structural Concrete

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This paper presents a sectional analysis of cracked fiber reinforced concrete (FRC) under flexural loading. The approach considers three separate loading conditions: monotonic, cyclic, and creep bending loads. Different parts of the approach are experimentally calibrated and validated with tests on polypropylene FRC. In the monotonic regime, numerical optimization is used to find the optimal stress–strain relation of FRC to capture the experimental bending behavior as closely as possible, while satisfying the horizontal force and bending moment equilibrium. To model the cyclic behavior, the constitutive law is extended by introducing a tension‐only scalar damage function. The agreement between the predicted and measured response is again very good, and the measured upwards shift of the neutral axis during unloading is predicted as well. Finally, the flexural creep response of a cracked FRC beam is simulated by using uniaxial creep data. The approach predicts the time‐dependent crack widening under sustained flexural loading and can be used to check SLS criteria in the design of FRC elements.

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normalɛ = w / s = δ / s .

…”

Section: Overview Of the Sectional Analysismentioning

confidence: 79%

Sectional analysis of the flexural creep of cracked fiber reinforced concrete

Vrijdaghs

Prisco

2021

Structural Concrete

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Comparative analysis of multilinear constitutive models of steel fiber reinforced concrete

Fasolo,

Kroetz,

Pieralisi

2024

Rev. IBRACON Estrut. Mater.

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The challenging task of structural design under structural safety, economic efficiency and environmental sustainability constraints has led to the development of several efficient materials. In this context, steel fiber reinforced concrete (SFRC) stands out due to the post-cracking behavior related to its enhanced toughness. Recent structural design normative codes consider this composite, suggesting good structural performance and broadening its applicability. Nevertheless, literature still lacks a comprehensive constitutive model to precisely describe its tensile behavior. This paper analyzes and compares three of the main European constitutive models, investigating factors that possibly influence their behavior. This study was conducted based on the cross-sectional analysis method, so that load-CMOD graphs could be obtained. Statistical analysis was conducted to classify the models, regarding several relevant parameters, such as mean compressive strength of the matrix and fiber volume. Results show that the constitutive law proposed by the fib Model Code shows the best performance. Also, from the set of considered parameters, ultimate tensile fibers strength presents the greatest sensitivity concerning structural post-crack behavior.

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Comparative Examinations of Structural Responses of Concrete Reinforced with Treated Oil Palm Empty Fruit Bunch (TOPEFB) and Untreated Oil Palm Empty Fruit Bunch (OPEFB) Fibres

Fapohunda

Adekunle

Adebayo

et al. 2023

EJSE

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The findings from the investigation conducted, to compare the structural performance of concrete containing treated (TOPEFB) and untreated Empty Oil Palm Fruit Bunch (OPEFB) fibres are presented in this paper. For the TOPEFB fibres, the dried fibres were treated with 0.2% NAOH solution following the procedures of appropriate authority. The structural parameters investigated were consistencies, setting times, densities, compressive and tensile strengths of concrete incorporating TOPEFB and OPEFB fibres in the mix. The addition of fibres was limited to 1.20% by weight of cement in the concrete. The interval of addition was 0.2%. The results showed that (i) the setting times of mortars containing TOPEFB fibres were higher than that of mortars with OPEFB fibres, (ii) concrete specimens containing TOPEFB fibres are more workable that concrete specimens with OPEFB fibres, (iii) densities of concrete specimens containing OPEFB fibres were in the range for normal concrete applications while the densities for specimens with TOPEFB developed densities that fell in the heavy weight concrete classification, (iv) concrete specimens containing TOPEFB fibres developed higher compressive strengths than specimens with OPEFB fibres and (v) tensile strengths of concrete specimens containing TOPEFB fibres were higher than specimens with OPEFB fibres by at least 59.04%. The overall conclusion from the findings of this study is that concrete specimens containing TOPEFB fibres have superior structural properties than specimens with OPEFB fibres

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Design of reinforced concrete beams with steel fibers in the ultimate limit state

Cited by 3 publications

References 16 publications

Sectional analysis of the flexural creep of cracked fiber reinforced concrete

Sectional analysis of the flexural creep of cracked fiber reinforced concrete

Comparative analysis of multilinear constitutive models of steel fiber reinforced concrete

Comparative Examinations of Structural Responses of Concrete Reinforced with Treated Oil Palm Empty Fruit Bunch (TOPEFB) and Untreated Oil Palm Empty Fruit Bunch (OPEFB) Fibres

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